PHOTOGRAPHS OF ELLIPTICAL AND SPIRAL NEBULAE. 

 By ISAAC ROBERTS, D.Sc, F.R.S. 



MESSIER 74 PISCllM. 



HKRSCHEL I. S4 COM.E. 



ilKSSTKR i;.-, T.F.OXTS. 



MKSSIER CI) T.ICOXIS. 



KnrI J'hnio Eii.jrainig Cc, 0. rinnifhiiry Purl:, .\. 



